You have to wear 6pc of one of the other sets to get the pages. The Haedrigs gift sets this season dont have set dungeons as they are recent additions, so they are not in the tome.

To gather Tome of Set dungeon pages in Diablo 3, you need at least five items of all four original armor sets for your class. If there is a set dungeon achievement for a set, it will count. How to gather Tome of Set Dungeon Pages in Diablo 3 Season 28 Rites of Sanctuary.

Set Dungeons have 4 total objectives, 3 normal and 1 mastery encompassing all of them together into a time limit. Luckily, gathering Tome of Set Dungeon pages is simple, as you only need certain item sets. Set Dungeons are a new Dungeon introduces in Diablo Patch 2.4.0 that require a full item set, rewarding players with unique cosmetics if they can complete the objectives. Tome of Set Dungeon Pages General Discussion Aly-2505February 18, 2023, 9:56am 1 I’ve seen a lot of confusion regarding the new node so let’s clarify: All you need to do is collect the 4 OG sets of your class (basically every other set than Haedrig’s gift) and go to the tome in Leoric’s Manor.

Diablo 3 tome of set dungeons page 71